karilaa.app seems down, and I've not heard from them

plasmatrap has been running our release candidate for a few days

that Japanese string exactly matches that i18n key

I have no clue why I wrote that code 😭

It's trivial to have more than 128 requests in flight: open a busy
timeline, scroll a bit down, wait for many notes to arrive, scroll to
the top. The frontend will send "subscribe to note" messages for each
new note that it accumulated, all at once. We don't want to shut down
the connection in those common cases!

* the frontend opens 2 websockets at startup (I'm not completely clear
  why), and that `minInterval:1sec` was breaking the second connection
* as the comment says, "catching up" generates many noteSubscribe
  messages

we're doing the same thing that Fastify does in the non-streaming
ServerService

3f73251d reworked the way `offsetMode`
is handled, to allow reactive `ComputedRef<boolean>` in addition to a
simple `boolean`, so that custom emoji search could easily switch
between the faster `sinceId`/`untilId` pagination and the slower
`offset` as needed.

Or it would have, if I had written the correct expression! I wrote
`props.offsetMode` instead of `props.pagination.offsetMode`, so it was
always `false`

I have *no idea* how I didn't notice, I swear I tested it ☹️

Anyway, factoring out the nested ternaries makes the whole thing
clearer and less prone to mistakes. And I have tested it, this time.

we were inconsistent with the colons, thanks to usedbunny for
noticing!

mostly, `ph-bold` was replacing the font-family, so we're now using
`sk-icons-lg`

Co-authored-by: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>